CVE-2026-83525

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{"bugzilla": {"description": "kafka: kafka: Denial of Service via crafted FetchSnapshot request", "id": "2562967", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562967"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-248", "details": ["Incorrect operator (CWE-480) in the FetchSnapshot RPC handler\nin Apache Kafka from 2.8.0 before 4.2.2, and from 4.3.0 before 4.3.2\non all platforms allows an authenticated attacker with\nCLUSTER_ACTION privilege to cause a denial of service\n(controller process termination) via a crafted\nFetchSnapshotRequest with an empty topics array or a topic\nwith no partitions.\nUsers are recommended to upgrade to version 4.2.2, 4.3.2, or\n4.4.0, which fix this issue. Users on unsupported branches\n(4.1.x and earlier) should upgrade to 4.2.2 or later.", "A flaw was found in Apache Kafka. An authenticated attacker with cluster administrative privileges can cause a Denial of Service (DoS) by sending a crafted snapshot request containing an empty topics array or a topic without partitions. Due to improper input handling in the FetchSnapshot Remote Procedure Call (RPC) handler, this issue causes the controller process to terminate unexpectedly."], "name": "CVE-2026-83525", "public_date": "2026-10-28T16:37:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-83525\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-83525\nhttps://github.com/apache/kafka/pull/23185\nhttps://kafka.apache.org/cve-list"], "statement": "This vulnerability is assessed as Moderate severity for Red Hat deployments because exploiting it requires an attacker to possess elevated cluster-level privileges (`CLUSTER_ACTION`). In standard production configurations, standard clients and untrusted users lack administrative authorization to issue snapshot fetch commands directly to the metadata controller. Although successful exploitation causes the controller daemon to crash and interrupts cluster coordination, the prerequisite of having high administrative access substantially limits the practical attack surface compared to an unauthenticated remote outage.", "threat_severity": "Moderate"}

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